A company plans to use eDiscovery in SharePoint. The environment includes Microsoft Lync Server 2013 and Microsoft Exchange Server 2013. Lync Server is configured to archive conversations to Exchange

Because Lync Server 2013 is configured to archive conversations directly to Exchange, SharePoint retrieves that content via Exchange; a direct server-to-server trust between SharePoint and Lync is not required for eDiscovery.

No SharePoint connector is created in the Exchange Management Shell; SharePoint initiates eDiscovery queries to Exchange over EWS using the trust established in Central Administration.

Exchange Server does not need the SharePoint Web Services API installed; it is SharePoint that calls out to Exchange via EWS, not Exchange calling into SharePoint.

A server-to-server OAuth trust between SharePoint Server and Exchange Server is required so that SharePoint's eDiscovery Center can authenticate to Exchange and query mailbox content on behalf of users during hold and search operations.

The Exchange Web Services Managed API must be installed on every SharePoint front-end web server because SharePoint uses EWS calls to communicate with Exchange and retrieve mailbox data for eDiscovery indexing and search.

There is no 'Exchange eDiscovery service application' in SharePoint Central Administration; eDiscovery is managed through an eDiscovery Center site collection and the server-to-server trust configuration.